US9481523B2 - Positive-drive spiral conveyor and belt - Google Patents

Positive-drive spiral conveyor and belt Download PDF

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Publication number
US9481523B2
US9481523B2 US13/805,608 US201113805608A US9481523B2 US 9481523 B2 US9481523 B2 US 9481523B2 US 201113805608 A US201113805608 A US 201113805608A US 9481523 B2 US9481523 B2 US 9481523B2
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drive
belt
rows
side edge
conveyor belt
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US20130213773A1 (en
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Casper Fedde Talsma
David W. Bogle
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Laitram LLC
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Laitram LLC
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Priority claimed from US12/834,314 external-priority patent/US8181771B2/en
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Assigned to LAITRAM, L.L.C. reassignment LAITRAM, L.L.C. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TALSMA, CASPER FEDDE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/06—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface having a load-carrying surface formed by a series of interconnected, e.g. longitudinal, links, plates, or platforms
    • B65G17/08—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface having a load-carrying surface formed by a series of interconnected, e.g. longitudinal, links, plates, or platforms the surface being formed by the traction element
    • B65G17/086—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface having a load-carrying surface formed by a series of interconnected, e.g. longitudinal, links, plates, or platforms the surface being formed by the traction element specially adapted to follow a curved path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G17/00—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface
    • B65G17/06—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface having a load-carrying surface formed by a series of interconnected, e.g. longitudinal, links, plates, or platforms
    • B65G17/08—Conveyors having an endless traction element, e.g. a chain, transmitting movement to a continuous or substantially-continuous load-carrying surface or to a series of individual load-carriers; Endless-chain conveyors in which the chains form the load-carrying surface having a load-carrying surface formed by a series of interconnected, e.g. longitudinal, links, plates, or platforms the surface being formed by the traction element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G21/00—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors
    • B65G21/16—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors for conveyors having endless load-carriers movable in curved paths
    • B65G21/18—Supporting or protective framework or housings for endless load-carriers or traction elements of belt or chain conveyors for conveyors having endless load-carriers movable in curved paths in three-dimensionally curved paths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2812/00—Indexing codes relating to the kind or type of conveyors
    • B65G2812/02—Belt or chain conveyors
    • B65G2812/02267—Conveyors having endless traction elements
    • B65G2812/02277—Common features for chain conveyors

Definitions

  • the invention relates generally to power-driven conveyors and more particularly to spiral conveyors in which a conveyor belt is positively driven in a helical path around a rotating drive tower.
  • Conveyor belts are often used to convey articles, such as food stuffs and other materials, through cooled or heated environments.
  • Spiral conveyors in which a conveyor belt follows a helical path winding around a central tower, drum, or cage, are used in freezers and ovens to provide a long conveying path with a small footprint.
  • Some helical conveyors are constructed with a helical track supported on a central non-rotating tower.
  • the conveyor belt is driven around the helical track by drive sprockets at a single location outside the helical path.
  • the maximum tension in the belt which occurs just ahead of its engagement with the drive sprockets, can be quite high for such a long belt.
  • overdrive spiral conveyor systems are used. In these overdrive systems, the conveyor belt is driven by frictional contact between the inside edge of the belt and the faster-rotating outer surface of the rotating drum about which the belt is helically wrapped. Because the belt is driven along the entire helical path, the maximum belt tension is decreased. But some tension is still needed for effective frictional engagement between the drum and the belt edge.
  • Positively driven spiral systems in which drive structure on the outside of a rotating cage engages structure on the inside of a conveyor belt, have been used to overcome some of the shortcomings of overdrive systems. Because there is positive engagement between regularly spaced drive structure on the cage and regularly spaced edge structure on the inside edge of the belt, there is no slip as in overdrive systems. No additional tensioning is needed and frictional losses are less. But one problem with positively driven spiral systems is in cleanly engaging the belt with and disengaging it from the drive structure on the cage.
  • One version of a conveyor belt embodying features of the invention comprises a series of rows of belt modules linked together between consecutive rows along hinge joints defining hinge axes extending perpendicular to a conveying direction from a first side edge of the rows to an opposite second side edge of the rows.
  • the hinge joints have play in the conveying direction to allow the rows to collapse together at the first side edge when the first side edge is at the inside of a turn in a conveying path.
  • the first side edge has a drive face. Teeth project outward from the first side edges of the rows to distal ends.
  • a guide surface on each tooth is oriented to guide an end of an external drive member between the teeth so that the drive member is in driving contact with the drive face of the row of a consecutive row to drive the conveyor belt in the conveying direction.
  • one version of a spiral conveyor comprises a rotating cylindrical drive tower that has an outer periphery extending from a bottom to a top.
  • a belt entry level is proximate the bottom for an upgoing spiral or proximate the top for a downgoing spiral.
  • Parallel drive members extend in length on the periphery of the drive tower.
  • Each has a ridge projecting radially outward from a bottom end to a top end. The bottom ends of the ridges are indented a first distance upward from the belt entry level for an upgoing spiral, or the top ends of the ridges are indented a first distance downward from the belt entry level for a downgoing spiral.
  • a conveyor belt advances up or down in a conveying direction along a helical conveying path around the outer periphery of the rotating cylindrical drive tower.
  • the conveyor belt includes a plurality of rows of belt modules having a top side and a bottom side and hingedly linked together between consecutive rows along hinge joints defining hinge axes extending perpendicular to the conveying direction from a first side edge of the rows to an opposite second side edge of the rows.
  • the hinge joints have play in the conveying direction to allow the rows to collapse together at the first side edge when the first side edge is at the inside of the helical conveying path.
  • the first side edge of each row includes a drive face and a series of outwardly extending teeth with guide surfaces oriented to guide the bottom ends of the ridges in an upgoing spiral or the top ends of the ridges in a downgoing spiral between the teeth so that the ridges are positioned in driving contact with the drive faces to drive the conveyor belt in the conveying direction along the helical conveying path.
  • a spiral conveyor comprises a drive tower that extends from a bottom to a top and rotates about a vertical axis.
  • Parallel drive members extend in length from the bottom to the top of the drive tower.
  • Each of the drive members has an outwardly projecting ridge whose distance from the vertical axis varies from the bottom to the top of the drive tower.
  • a conveyor belt is positively driven on a helical path around the drive tower by the ridges of the drive members engaging the inside edge of the belt.
  • FIG. 1 is a side elevation schematic of a spiral conveyor system embodying features of the invention
  • FIGS. 2A and 2B are profile and head-on views of a lower segment of the drive members of the drive tower of FIG. 1 ; and FIG. 2C is a top plan view of the spiral conveyor belt entering the lower segment of the drive members of the drive tower of FIG. 1 ;
  • FIGS. 3A and 3B are profile and head-on views of an intermediate segment of the drive members of the drive tower of FIG. 1 ;
  • FIGS. 4A and 4B are profile and head-on views of an upper segment of the drive members of the drive tower of FIG. 1 ;
  • FIGS. 5A and 5B are top and bottom axonometric views of an inside edge of a sideflexing conveyor belt module embodying features of the invention
  • FIG. 6 is an axonometric view of the inside edge of another version of a sideflexing conveyor belt module embodying features of the invention.
  • FIG. 7 is an axonometric view of the inside edge of yet another version of a sideflexing conveyor belt module embodying features of the invention.
  • FIG. 8 is an axonometric view of the inside edge of still another version of a sideflexing conveyor belt module embodying features of the invention.
  • FIG. 9 is a top plan view of the inside edge of another version of a sideflexing conveyor belt and the periphery of a drive tower embodying features of the invention.
  • FIG. 10 is an axonometric view of a portion of the inside edge of a conveyor belt constructed of the modules of FIGS. 5A and 5B ;
  • FIG. 11 is a side elevation view of another spiral conveyor using a modular conveyor belt as in FIGS. 5-8 ;
  • FIG. 12 is an oblique view of a portion of a drive member of a spiral conveyor as in FIG. 11 ;
  • FIG. 13 is a cross section of the drive member of FIG. 12 taken along lines 13 - 13 ;
  • FIG. 14 is a side elevation view of a portion of the spiral conveyor of FIG. 11 showing the drive tower at the belt entry level;
  • FIG. 15 is an enlarged view at the belt entry level of the spiral conveyor of FIG. 11 showing the initial engagement of the conveyor belt with the drive members;
  • FIG. 16 is a side elevation view, with a superimposed force diagram, of another version of a spiral drive tower with helical drive bars on the periphery of the tower usable with conveyor belts made of modules as in FIGS. 5-8 ;
  • FIGS. 17 and 18 are oblique views of two other versions of drive towers with outwardly extending bottom skirt portions usable with conveyor belts made of modules as in FIGS. 5-8 .
  • a spiral conveyor is shown schematically in FIG. 1 .
  • the spiral conveyor includes a drive tower 10 in the form of a cylindrical drum or cage that is driven to rotate about a vertical axis 12 .
  • the rotating tower has a plurality of parallel, generally vertical drive members 14 spaced apart regularly around its periphery 16 . Each drive member extends in length between the bottom 18 and the top 19 of the tower.
  • the conveyor belt 20 follows a multi-tiered helical path around the tower. The path is defined by a helical carryway or by a carryway at the bottom and stacker plates mounted on the belt. The inside edge of the belt positively engages the drive members, which drive the belt up the tower as it rotates.
  • the belt travels around various take-up, idle, and feed sprockets 22 as it makes it way from the exit at the top of the tower back to the entrance at the bottom.
  • the tower 10 is mounted at its bottom to a base 24 and is rotated by a motor and gears (not shown).
  • Each of the drive members 14 comprises a generally vertical rail 26 , which is affixed at the bottom 18 to a lower ring 27 of the drive tower 10 , and a ridge 28 that protrudes outward of the rail, as shown in FIGS. 2A and 2B .
  • the ridge is shown formed on an overlay 32 that covers the outer face 34 of the rail along just about all its length. As shown in FIG. 2C , tabs 36 hold the overlay to the rail. Instead of being formed on an overlay, the ridge could be welded directly onto the rail or formed monolithically with it.
  • the ridge 28 includes a constant-height region 40 and a tapered region 42 .
  • a constant-height region begins at the bottom of the rail and extends upward to the tapered region.
  • the height of the ridge 28 increases from a height h 2 in the constant-height region to a maximum height h 1 at the upper end of the tapered region.
  • the distance of the ridge 28 from the vertical axis 12 ( FIG. 1 ) of the drive tower increases from a constant distance to a greater distance at the upper end of the tapered region.
  • the constant-height region of the lower segment 38 is angled off vertical by an angle ⁇ .
  • the off-vertical orientation and the low height h 2 of the ridge in the bottom portion of the lower segment of the drive tower facilitate the entry of the conveyor belt 20 onto the rotating tower, as shown in FIGS. 2B and 2C .
  • the conveyor belt 20 is shown as a modular plastic conveyor belt constructed of a series of rows of belt modules 44 conventionally interconnected row-to-row by hinge rods (not shown).
  • the belt advances tangentially in to the rotating tower 10 , one of its inside edges 46 may contact one of the ridges 28 .
  • the ridge eventually slides off the inside edge and into a gap 48 between adjacent belt rows.
  • the angled orientation of the ridge in the lower segment helps guide the belt into proper engagement as it rides along its inclined helical path 50 .
  • the ridge has assumed a position just upstream of the inside edge of a belt row. In this position, the driving member is engaged with the inside edge of the belt to positively drive it along the helical path 50 without slip.
  • the ridge gradually increases in height to its maximum height h 1 . The gradual increase further aids in the transition of the belt into full positive engagement with the rotating tower, as indicated by the max-height drive member 14 ′.
  • the ridge 28 extends out to the maximum height h 1 in an intermediate segment 52 of each drive member 14 .
  • the intermediate segment is disposed on the periphery of the drive tower just above the lower segment 38 , as shown in FIGS. 3A and 3B .
  • the intermediate segment constitutes the majority of the height of the tower and, consequently, provides most of the driving engagement with the conveyor belt.
  • the intermediate segment may be vertical as shown or slanted off vertical.
  • the height of the ridge tapers from the maximum height h 1 to zero at the top, as shown in FIGS. 4A and 4B .
  • each drive member 14 The tapering occurs in an upper segment 54 of each drive member 14 .
  • the top of each rail is affixed to an upper rim 56 .
  • the decreasing height of the ridge 28 , or its distance from the drive tower's vertical axis, in the upper segment allows the belt to disengage gradually and neatly from the drive members of the rotating tower.
  • the spiral conveyor of FIGS. 1-4 positively drives a conveyor belt without overdrive along a helical path with drive members that engage the inside edge of the belt with a ridge that varies in height from the bottom to the top of the rotating spiral drive tower.
  • An edge belt module 60 shown in FIGS. 5A and 5B can be used to construct a sideflexing conveyor belt with different edge structure from that of the belt 20 of FIG. 2C .
  • the edge module 60 has a tent-shaped tooth 62 attached to a cavity 64 in a side edge 66 of the belt. The tooth is pressed into the cavity 64 from the top side 68 of the module.
  • the head of a screw 70 screwed into a corner of a projection 72 extending from the base 74 of the tooth grabs the bottom side 69 of the module at an inside corner of the cavity to attach the tooth to the module.
  • the tooth can be detached from the module by removing the screw.
  • the projection 72 also partially occludes the module's pivot rod hole 76 to help retain the hinge rod within the belt.
  • the tooth could be inserted from the bottom side 69 instead and retained in the same way. So these teeth can extend upward from the top side 68 or downward from the bottom side 69 .
  • the tent-shaped tooth has a pair of guide surfaces 78 , 79 that converge with distance from the distal end 80 of the tooth.
  • FIG. 6 Another version of a tooth extending from the inside edge of a belt module is shown in FIG. 6 .
  • a diamond-prism-shaped tooth 82 extends radially outward of the inside edge 84 of the module 86 .
  • the diamond-shaped tooth is unitarily molded with the module and has four guide surfaces 88 A-D and two vertical drive faces 89 A, 89 B.
  • the tent-shaped tooth 62 of FIGS. 5A and 5B could be unitarily formed with the edge module and the diamond-shaped tooth of FIG. 6 could be made as a separate piece that can be attached to the module.
  • FIG. 7 Another belt module with a unitarily molded tooth is shown in FIG. 7 .
  • the belt module 130 has a tooth 132 in the shape of a truncated triangular prism projecting radially outward from an inside edge 134 of the module.
  • Guide surfaces 136 , 137 converge from top and bottom surfaces of the module.
  • the base of the triangular prism acts as a drive face 138 .
  • the belt module 140 of FIG. 8 has a tooth 142 in the form of a cylindrical oval.
  • the tooth has rounded guide surfaces 144 , 145 with opposite drive faces 146 , 147 lying between.
  • FIG. 10 A portion of a conveyor belt 90 made of modules having an inside edge as in FIGS. 5A and 5B is shown in FIG. 10 .
  • the belt portion shows the modules linked together in rows 92 by hinge rods 93 at hinge joints 94 extending perpendicular to the conveying direction 96 .
  • the pitch of the belt is the distance between consecutive hinges.
  • Hinge-rod apertures 98 are elongated in the conveying direction to provide enough play in the conveying direction for the side edge 100 of the belt to collapse at the inside of a turn while the opposite outside edge expands to follow its longer path on an outer radius. Because the belt 90 can be in low tension entering a spiral drive tower, the rows may be collapsed together as shown in FIG. 10 .
  • the trailing guide surfaces 79 of the teeth 62 decline from their distal ends 80 toward drive faces 102 facing consecutive trailing modules.
  • the leading guide surfaces 78 of the teeth 62 decline from their distal ends 80 in the opposite direction toward rearward-facing drive faces 102 on consecutive leading modules.
  • Opposite faces 103 on the edges of the belt can be used as drive faces if the belt is operated in the opposite direction.
  • a spiral drive tower 104 is shown in FIG. 11 with the conveyor belt 90 following a helical path 106 around the periphery of the tower.
  • Vertical drive members 112 extend in length from the top 114 to the bottom 115 of the tower.
  • the drive members are preferably positioned on spacings equal to an integral multiple of the belt pitch for optimal operating characteristics. But the y could also be spaced at non-integral multiples of the belt pitch or non-uniformly at differing integral multiples of the belt pitch.
  • Ridges 116 protrude radially outward of the spaced apart drive members 112 from top ends 118 of the ridges to bottom ends 119 .
  • the conveyor is an upgoing spiral rotating in the direction 108 with a helically rising conveying direction 110 .
  • the belt initially engages the tower at a belt entry level 120 that is below the bottom ends 119 of the ridges.
  • the belt rides around the tower on a slightly inclined path for about 90° or so, or whatever circumferential arc length is needed for the inside edge of the belt to collapse, before rising to the level of the bottom ends 119 of the ridges 116 .
  • the bottom end 119 of the ridge 116 is tapered.
  • the drive member 112 is a flat strip with the ridge protruding outward along the majority of its length. Grooves 121 in opposite edges of the strip receive the edges of peripheral structure 122 forming the tower's periphery.
  • FIG. 14 shows the bottom tier of the conveyor belt engaging the tower below the bottom ends 119 of the ridges 116 .
  • the bottom ends of the ridges are indented a vertical distance 124 above the belt entry level 120 .
  • the inside edge of the belt rides along the tower in frictional contact with the periphery of the tower to give the inside edge of the belt an opportunity to collapse.
  • the belt 90 rises to the bottom ends 119 of the ridges 116 .
  • the distal end 119 of the ridge 116 first contacts the tooth 62 extending upward from the top side 68 of one of the belt rows in one of three places: (a) the leading guide surface 78 ; (b) the trailing guide surface 79 ; or (c) the distal end 80 . If the initial contact is on the leading guide surface 78 , the bottom end 119 of the ridge tends to ride down the leading guide surface and push the row rearward away from the leading row so that the ridge fits between the rows in a position to positively drive the leading row.
  • the bottom end 119 of the ridge 116 first contacts the trailing guide surface 79 , the bottom end slides down the guide surface into the gap between the row and the consecutive trailing row into a position for the leading side 126 of the ridge to impart a driving force against the drive face 102 ( FIG. 10 ) of the row. If the bottom end of the ridge initially contacts the top distal end 80 of the tooth 62 , the ridge could slide down either guide surface, depending on friction and any belt tension.
  • the belt entry level is above the top ends of the ridges at the top of the tower.
  • the ridges are indented below the entry level by a vertical distance sufficient to allow the inside edge of the belt to collapse against the periphery of the tower.
  • the teeth for a belt in a downgoing spiral extend downward from the bottom side of the belt to engage the top ends of the ridges.
  • a conveyor belt constructed of modules as in FIG. 6 with guide surfaces 88 A-D directed both up and down and drive faces 89 A, 89 B or as in FIG. 8 with rounded to and bottom guide surfaces 144 , 145 and drive faces 146 , 147 could be used in both downgoing and upgoing spirals and driven in either direction.
  • the two guide surfaces 136 , 137 of the triangular tooth 132 in the module of FIG. 7 allow a conveyor belt constructed of such modules to be driven against its drive face 147 in either an upgoing or a downgoing spiral.
  • FIG. 9 shows a sideflexing conveyor belt with edge modules 150 that have multiple teeth extending radially outward of each row.
  • Each of the teeth 152 , 153 has a leading angled guide surface 154 and a trailing drive face 156 forming a sawtooth shape.
  • Each drive member 158 on the periphery of the drive tower has a plurality of sawtooth-shaped ridges 160 with leading drive sides 162 .
  • the guide surfaces 154 guide leading drive sides 162 of the ridges into driving contact with a leading drive face 156 .
  • the ridges on the tower are slightly thinner than the teeth on the belt so that they interfit more easily. And the higher tooth density provides the drive tower with more available points of engagement.
  • the drive members on the peripheries of the drive tower shown in FIGS. 1-4 and in the drive tower shown in FIGS. 11-15 are generally vertical, the drive members could be slanted off vertical as shown in FIG. 16 .
  • the drive tower 166 has ridges 168 on its drive members slanted off vertical on the periphery 170 of the tower to form a helical arrangement.
  • a conveyor belt 172 is shown operating as a downgoing spiral along a helical path 174 .
  • the belt is constructed with edge modules having teeth as in FIG. 7 , i.e., teeth with a face oblique to the conveying direction, preferably at the same angle as the slant of the drive ridges off vertical.
  • the bottom guide surface 136 guides the top end 176 of the drive members into initial contact with the belt edge.
  • the leading edges 178 of the ridges engage the edge modules' top guide surfaces 137 , which act as drive surfaces instead.
  • the force diagram superimposed on the tower of FIG. 16 shows that the total force FT applied by the leading side 178 of the slanted ridge 168 against the similarly slanted tooth face 137 (shown enlarged) and acting in a direction normal to the face has a downward vertical component Fv, which helps hold the inside edge of the conveyor belt down. This obviates the need for the additional hold down structure that would be needed with a conveyor belt entering a spiral drive tower with vertical drive members as in the previous versions. And with the forward-slanted ridges of FIG. 16 , the conveyor belt would move faster than the rotation of the drive tower. If the ridges were slanted in reverse, the belt would move slower.
  • FIGS. 17 and 18 Two other versions of drive towers are shown in FIGS. 17 and 18 .
  • the drive tower 180 in FIG. 17 has a cylindrical upper portion 182 and a skirt portion 184 the tapers outwardly away from the tower's vertical axis 186 toward the bottom 188 of the tower.
  • the drive tower 190 in FIG. 18 has an upper portion 192 with a first diameter d 1 .
  • a skirt portion 194 includes a bottom portion 196 having a second diameter d 2 that is greater than the first diameter d 1 of the upper portion 192 .
  • a tapered portion 197 connects the bottom portion 196 to the upper portion 192 .
  • a conveyor belt entering either of the skirted drive towers from the bottom has some amount of initial tension in the outside edge of the belt. As the inside edge of the conveyor belt begins to collapse as it rides spirally up the skirt portion of the tower, the diameter of the tower decreases slightly in the skirt portion to help relieve the tension in the outside edge of the conveyor belt.
  • the spiral conveyors of FIGS. 11-18 positively drive a conveyor belt without overdrive along a helical path with drive members that engage the inside edge of the belt with a ridge that is initially guided into a driving position against a drive face on the belt.
  • the spiral conveyor system also allows the use of belts whose inside turn radius does not match the radius of the drive tower.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Chain Conveyers (AREA)
US13/805,608 2010-07-12 2011-07-08 Positive-drive spiral conveyor and belt Active 2031-10-08 US9481523B2 (en)

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US13/805,608 US9481523B2 (en) 2010-07-12 2011-07-08 Positive-drive spiral conveyor and belt

Applications Claiming Priority (5)

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US12834314 2010-07-12
US12/834,314 US8181771B2 (en) 2010-07-12 2010-07-12 Positive-drive spiral conveyor
US201161479620P 2011-04-27 2011-04-27
PCT/US2011/043352 WO2012009222A1 (fr) 2010-07-12 2011-07-08 Transporteur à vis à entraînement forcé et bande
US13/805,608 US9481523B2 (en) 2010-07-12 2011-07-08 Positive-drive spiral conveyor and belt

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US12/834,314 Continuation-In-Part US8181771B2 (en) 2010-07-12 2010-07-12 Positive-drive spiral conveyor
PCT/US2011/043352 A-371-Of-International WO2012009222A1 (fr) 2010-07-05 2011-07-08 Transporteur à vis à entraînement forcé et bande

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US15/337,147 Division US10023388B2 (en) 2010-07-12 2016-10-28 Positive-drive spiral conveyor

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US20130213773A1 US20130213773A1 (en) 2013-08-22
US9481523B2 true US9481523B2 (en) 2016-11-01

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US13/805,608 Active 2031-10-08 US9481523B2 (en) 2010-07-12 2011-07-08 Positive-drive spiral conveyor and belt
US15/337,147 Active US10023388B2 (en) 2010-07-12 2016-10-28 Positive-drive spiral conveyor
US16/011,031 Active US10189645B2 (en) 2010-07-12 2018-06-18 Positive-drive spiral conveyor
US16/259,577 Active US10501265B2 (en) 2010-07-12 2019-01-28 Positive-drive spiral conveyor
US16/559,757 Active US10766705B2 (en) 2010-07-12 2019-09-04 Positive-drive spiral conveyor
US16/559,777 Active US10766706B2 (en) 2010-07-12 2019-09-04 Methods for positively-driving spiral conveyors
US17/012,197 Active US11383932B2 (en) 2010-07-12 2020-09-04 Positive-drive spiral conveyor
US17/737,185 Active US11970337B2 (en) 2010-07-12 2022-05-05 Positive-drive spiral conveyor belt
US18/644,751 Pending US20240270500A1 (en) 2010-07-12 2024-04-24 Positive-drive spiral conveyor belt

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US16/259,577 Active US10501265B2 (en) 2010-07-12 2019-01-28 Positive-drive spiral conveyor
US16/559,757 Active US10766705B2 (en) 2010-07-12 2019-09-04 Positive-drive spiral conveyor
US16/559,777 Active US10766706B2 (en) 2010-07-12 2019-09-04 Methods for positively-driving spiral conveyors
US17/012,197 Active US11383932B2 (en) 2010-07-12 2020-09-04 Positive-drive spiral conveyor
US17/737,185 Active US11970337B2 (en) 2010-07-12 2022-05-05 Positive-drive spiral conveyor belt
US18/644,751 Pending US20240270500A1 (en) 2010-07-12 2024-04-24 Positive-drive spiral conveyor belt

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US10604345B2 (en) 2016-06-15 2020-03-31 Laitram, L.L.C. Flat-top side-drive modular conveyor belt
US11014751B2 (en) 2017-03-03 2021-05-25 Cambridge International, Inc. Direct edge drive conveyor belt
US11014754B2 (en) * 2017-05-24 2021-05-25 Steven Kelley Spiral conveyor system for immersing items in a liquid
US10947048B2 (en) * 2017-07-12 2021-03-16 Habasit Ag Positive drive for a spiral conveyor and belt module for a radius or spiral conveyor
US10730701B1 (en) 2019-04-09 2020-08-04 John Bean Technologies Corporation Spiral conveyor drum bar
WO2020209844A1 (fr) 2019-04-09 2020-10-15 John Bean Technologies Corporation Barre de tambour de transporteur à vis
US11053081B2 (en) 2019-05-08 2021-07-06 Cambridge International, Inc. Direct drive spiral conveyor belt systems and methods
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US10766705B2 (en) 2020-09-08
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US20200399067A1 (en) 2020-12-24
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US11970337B2 (en) 2024-04-30
US10501265B2 (en) 2019-12-10
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US10189645B2 (en) 2019-01-29
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